Constant -current source circuit with adjustable it is small -size

• Main Authors: Fu Qingbo, Dong Xuyi
• Format: Patent
• Language: Chinese; English
• Published: 10.08.2016
• Subjects: CONTROLLING; PHYSICS; REGULATING; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

The utility model discloses a constant -current source circuit with adjustable it is small -size, simple structure, low in production cost, this circuit adopt the single mains operated of low pressure, can realize through digital command control, and its basic mode module circuit also can control through input analog voltage signal, and output current can be along with control voltage continuously?adjustable, improve through carrying out gain control to the negative feedback part, its output current precision can promote to original tens times under the same condition of current control voltage precision, after increasing ADC control method, can eliminate the error that offset voltage that fortune put and hardware circuit temperature drift brought. 本实用新型公开种小型可调式恒流源电路，结构简单，生产成本低，该电路采用低压单电源供电，可以实现通过数字指令控制，其基本型模块电路也可以通过输入模拟电压信号控制，输出电流可以随着控制电压连续调节；通过对负反馈部分进行增益控制改进，在电流控制电压精度相同的情况下其输出电流精度可提升至原来的几十倍；增加ADC控制方法后，可以消除运放的偏置电压和硬件电路温度漂移带来的误差。